db906fd85a
- Replace .eslintrc.cjs with eslint.config.mjs (ESLint 9 flat config)
using direct eslint-plugin-solid + @typescript-eslint/parser approach
- Add @typescript-eslint/parser to root devDependencies
- Add main/module/types top-level fields to packages/core/package.json
- Add resolve.conditions to packages/core/vite.config.ts
- Create packages/core/tsconfig.test.json for test type-checking
- Remove empty paths:{} from packages/core/tsconfig.json
244 lines
12 KiB
Markdown
244 lines
12 KiB
Markdown
Share
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- [Share on Facebook](https://www.facebook.com/sharer.php?u=https%3A%2F%2Fbyteiota.com%2Fvite-8-0-rolldown-migration-guide-10-30x-faster-builds%2F "Share on Facebook")
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Vite 8.0 stable dropped on March 12, 2026, replacing its dual-bundler architecture with [Rolldown](https://rolldown.rs/), a single Rust-based bundler delivering 10-30x faster builds. Linear saw production builds shrink from 46 seconds to 6 seconds—an 87% reduction. With Vite downloaded 65 million times weekly, this upgrade affects millions of developers. Here’s your migration guide.
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## Vite 8 Unifies Build Pipeline with Rolldown
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Vite 8 consolidates two bundlers into one. Previously, Vite used esbuild for fast development and Rollup for optimized production builds. This dual-bundler approach worked but created potential inconsistencies between dev and prod environments. Rolldown eliminates that split.
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Rolldown is a Rust-based bundler with full Rollup API compatibility. It matches esbuild’s development speed while delivering 10-30x faster production builds than Rollup. In official benchmarks testing 19,000 modules, Rolldown completed in 1.61 seconds versus Rollup’s 40.10 seconds—a 25x improvement.
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The architectural unification simplifies configuration. Developers no longer juggle separate esbuild and rollupOptions settings. One bundler, one config, consistent behavior across environments.
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## 10-30x Faster Builds in Real-World Projects
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Performance gains are substantial. [Linear reduced production build times by 87%](https://vite.dev/blog/announcing-vite8), dropping from 46 seconds to 6 seconds. Beehiiv’s large codebase saw 64% improvement. Mercedes-Benz.io cut build times by 38%.
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However, performance gains scale with project size. Small projects under 100 modules see 2-5x improvements. Mid-sized projects between 100-500 modules hit 5-10x. Large projects with 500+ modules achieve the advertised 10-30x gains.
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One developer testing a single-page app watched builds shrink from 3.8 seconds to 0.8 seconds—a clean 5x improvement. For large enterprise apps, these savings multiply across hundreds of daily builds, cutting hours from CI/CD pipelines.
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## How to Migrate to Vite 8
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Migration is straightforward for most projects. Update Vite to 8.0, test locally, deploy if no issues arise. A compatibility layer auto-converts esbuild and rollupOptions configurations to Rolldown equivalents.
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Basic migration:
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```bash
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# Update to Vite 8.0
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npm install vite@8
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# Test development server
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npm run dev
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# Test production build
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npm run build
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# Benchmark performance
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time npm run build
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```
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Most projects work without configuration changes. The compatibility layer handles the transition automatically. If you encounter issues, [Vite provides a gradual migration path](https://main.vite.dev/guide/migration): test with rolldown-vite on Vite 7 first, then upgrade to Vite 8 stable. This two-step approach isolates Rolldown-specific problems from general upgrade issues.
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## Should You Upgrade? Decision Framework
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Upgrade priority depends on project size and build frequency. Large codebases with 500+ modules benefit most—10-30x gains justify immediate migration. Teams running multiple builds daily see compounding time savings. If CI/CD pipelines take 40 seconds per build, Rolldown cuts that to 2 seconds, saving 38 seconds × 100 builds = 63 minutes daily.
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Mid-sized projects between 100-500 modules should upgrade within the month. You’ll see 5-10x improvements—noticeable but not game-changing. Standard release cycles (daily or weekly deploys) make this a medium priority.
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Small projects under 100 modules see 2-5x gains. Still worthwhile, but less impactful. If you’re risk-averse or running mission-critical production apps, waiting 1-2 months for community feedback is reasonable. Let others find the edge cases first.
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Skip immediate upgrade if you rely on obscure Rollup plugins that may lack Rolldown compatibility. Check the Vite plugin registry first. Also skip if you’re on Vite 6 or older—address that gap before jumping to Vite 8.
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## Troubleshooting Common Migration Issues
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Three issues account for most migration headaches: CommonJS interop changes, manualChunks deprecation, and esbuild transform failures.
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CommonJS imports may break due to Rolldown’s stricter module handling. If runtime errors appear when importing CJS modules, add `legacy.inconsistentCjsInterop: true` to your config temporarily. Long-term, migrate to ESM or fix module resolution. This isn’t Vite’s fault—it’s exposing existing module system inconsistencies.
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The `manualChunks` config no longer works. Vite 8 uses `codeSplitting` instead, offering more granular control:
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```javascript
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// OLD (Vite 7)
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export default defineConfig({
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build: {
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rollupOptions: {
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output: {
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manualChunks(id) {
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if (/\/react(?:-dom)?/.test(id)) {
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return 'vendor'
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}
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}
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}
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}
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}
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})
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// NEW (Vite 8)
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export default defineConfig({
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build: {
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rolldownOptions: {
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output: {
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codeSplitting: {
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groups: [\
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{ name: 'vendor', test: /\/react(?:-dom)?/ }\
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]
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}
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}
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}
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}
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})
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```
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Plugins using `transformWithEsbuild` will fail because esbuild is no longer bundled. Migrate to `transformWithOxc` or install esbuild manually as a peer dependency. The @vitejs/plugin-react v6 already made this switch, using Oxc for React Refresh transforms and eliminating the Babel dependency entirely.
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## What’s Next for Vite
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Vite’s roadmap includes Full Bundle Mode (experimental), which serves bundled files in development for 3× faster dev server startup, 40% faster full reloads, and 10× fewer network requests. This addresses one of Vite’s last pain points—hundreds of separate module requests in large apps.
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[VoidZero](https://voidzero.dev/posts/announcing-rolldown-rc), the team behind Vite and Rolldown, is building a unified Rust toolchain for JavaScript development. Rolldown handles bundling, Oxc powers compilation and minification, and more tools are coming. The trend is clear: Rust-based tooling is replacing JavaScript-based build tools across the ecosystem, from swc to turbopack to Biome.
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## Key Takeaways
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- Vite 8.0 stable replaces esbuild + Rollup with a single Rust bundler (Rolldown), delivering 10-30x faster production builds while maintaining plugin compatibility
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- Large projects (500+ modules) see the biggest gains (10-30x), mid-sized projects hit 5-10x, small projects get 2-5x—performance scales with codebase size
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- Most projects migrate without config changes thanks to auto-conversion, but CommonJS interop and manualChunks require manual fixes
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- Upgrade now if you’re on Vite 7 with large codebases or frequent builds—the stable release is production-ready and compatibility is high
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- Future Vite improvements (Full Bundle Mode, Rust toolchain expansion) show continued innovation, making this a safe long-term bet
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Vite 8 isn’t just faster—it’s simpler. One bundler, one config, one mental model. The dual-bundler era is over.
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### Share
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## [](https://byteiota.com/)
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